Electric soldering-iron



Q. STLHANE AND 0. D. KRING..

ELECTRIC 'SOLDERING IRONz APPLICATION FILED AIILS, 1919.

UNITED STATES PATENT OFFICE.

OTT() STLHANE AND OLOF OSKAR KRIG, OF DJ'URSI-IOLM, SVIEJDEFI'.

`Eiinc'iiaic soLDERiNe-IRON.

To all 'whom t mag/concern: l

Be it' known that we, 'r'roV STLHANE and OLor OsKAR KRiNc, engineers, lsubjects of the King of Sweden, residing in Djursholin,

in theKingdoin of Sweden, have invented y 'chamber or cavity inthe soldering bolt or iron' itself. In hitherto knownv devices of this kind the actual resistance material', in the form of a in etal wire'or a, metal band, has been embedded in an insulating refractory mass, or wound on a core' of' insulating material. SuchV devices havegreat drawbacks. Firstly in a resistance wire embedded in an insulating mass there` is required a considerable 'super-temperature in Specification of Letters Patenti.

the wire on account of the unfavorable transmission of heat, and secondly it is exposed to mechanical strains whichgradually cause its rupture, owing to the fact that the wire and theinsulating material as a rule have greatly varying coeilicients of eX- In accordance with the present invention the` resistance element* is arranged in such a manner that these drawbacksare obviated, for which purpose the resistance element-is made of metal` wire or strips wound in a coil or other suitable form which resistance element is arranged in one or more tubes of refractory, electricallyr non-conducting material7 placed in cavity in the soldering bolt or iron itself. The tubes are preferably made of quartz glass, whichisnot injured by irregular heating and which, moreover, owing to the fact that it is transparent, facilitates the transmission of heat from the resistance wire to the iron by means of radiation. Another advantage of` this arrangement resides in the fact that the heating element'can beV removed and replaced` element in horizontal projection.

tion and Figs. 4 8 showanother forni of a soldering iron with an exchangeableheatingelement in accordance with the present invention. The corresponding parts are provided with the ysaine reference numbers in the different figures.

Fig. l shows the soldering iron, viewed from the front. Fig. 2 is a section along the line AHB in Fig. l, and Fig. 3 is a section along the line C-D in Fig. l. a heating element invertical section along the line AB in Fig. 5, which'shows the Fig. G shows the element in vertical and Fig. 7 in horizontal projection. Fig. 8 shows the front part of the' soldering iron in vertical section.

The invention is first described with refei ence to Figs. lf3.

l designates the soldering bolt or iron which may bemade in vone piece (see for eX- ample Fig. 8), but which according to Figs. 1-3 is shown composed of two parts, viz.V a tubular `part la anda solid part or soldering edge lb, made of copper or other suitable material. The upper4 part of the iron yis surrounded by a protective casing 2, unitcr with the shaft 8 of thebolt in which casing the bolt or soldering iron isheld securely by means of the screws 4L. The bolt l has an oval cross section, and is provided with a boring or excavation shaped in a Vspending manner, in which two quartz tubes 5 are inserted. yln these quartz tubes are placed coils 6 (see Fig. 2, not shown in F ig. of a suitableresistance material- The coils are connected with the inducting wire for the electric current passing out through the shaft. y

. vThe part la is preferably made of a metal tube of suitable section, into the one end of which is fitted another metal part lb, serving as actual soldering wedge or top of the bolt. By this arrangement several advantages are attained. First thatV part lb of the soldering iron, 'which gets consumed, is easily inter-changeable; secondly the part la can be made merely by being cut out of a tube with a corresponding section; thirdly the interior of the bolt is easily accessible for the insertion of the coils; and finally a soldering bolt with this arrangement can be made with a minimum of weight and volume in proportion to its capacity.

Figs. 47 show a treating element detachable from the bolt and intended'to be used y Patented July 6,1920.

Application inediiprn 3, 1919. serial No. 287,327.

Fig. i shows iio in soldering bolts in accordance with the present invention. 5 are the refractory tubes, in some suitable manner fixed in an attachment 8 ot porcelain, lire clay or other ret actory or heat-resisting material, on which also two or more electric contacts 9 with set-screws are placed. The ends olf the resistance coils are connected to these contacts. Together these parts :term a heat-l ing element Which can be easily inserted in the cavity of the actual soldering bolt or soldering iron.

In Fig. 8, l designates the soldering iron placed in the holder 2 or the casing, and provided with inner cavity or chambers l2, in which. the said heating elei t serted. The holder 2 is provided iv' 2, which is securely held by means olf the screw 13, and which retains the heating elcment in its true position within the bolt. ln the prolongation 5 et the hol l r serving as a shaft are arranged conduct g' Wires 'T for the supply oi? current, wliicn. wires are connected with the contacts i e nates a ring oit asbestos of .similar insulatingmaterial, which is riens il i Y i tween the lower edge oi' the holder L n e soldering-iron l, whereby transin: on oit .heat :from the latter to the holder is o.: ated and at the same time a steady coimecticn between 'the )arts i s The holder 2 and the soldering l may ixed to one another by in ans ciIl set-scrmvs in similar manner to tha t grown in l.

lt is obvious that a soldi ing iri'n in accordance with the present invent can be constructed in other Ways than thi 1 shown in the drawing, while retaining the chay ic- 'fhus the example a teristic features of the 'ii/'entienn part i may be made with, ttor circular cross-.ectioin in which case it most suitable to employ 'three insulating tubes. As in this case one end el? thA Y sistance wire Wound in a coil will be the part l at its end cing the part ib, it is most suitable to lead out the cmincctinf` wire through 'the centrally situated. channel, which arises between the three tubes. Blz/iturally even more than three insulating tubes can be employed, and 'the part l can be given another suitable cross section than those above indicated.

Having thus described our invention, we declare, that what we claim izl. An electric soldering bolt or iron ot the class described, consisting ot a soldering bolt provided with a cavity or chamber, resistance heating elements arranged wi thin a tube or tubes of refractory electrically insulating material inrerted in the said cavity, said tube or tubes together with a resistance element ormingtogether a technical unit removably arranged Within said cavity.

2. iin electric soldering bolt or iron ol the kind described, consisting olf a soldering bolt provided with a cavity or chamber, sistance heating elements arranged within a tube or tubes oil? refractory electrically insulating material inserted in the said cavity, said tube or tubes containing the resistance element being fastened to a holder of insulating material and removably inserted within the cavity or boring of the soldering bolt.

An electric soldering bolt or iron of the kind described, consisting ot a soldering bolt provided with a cavity or chamber, resistance heating elements arranged Within tube or tubes or' refractory electrically insulating material inserted in the said cavity, said tube or tubes containing the resistance elements being fastened to a holder of insulL ring material and removably inserted Within the cavity or boring ol the soldering bolt, said holder being provided with contacts to which the terminals of the resistances are connected and provided with .rneans for connecting conducting wires tor supplying electric current to the same.

In testimony whereof, We ailix our signatures.

OTTO STLHANE. OLOF OSKAR KR'ING.

Witnesses z ALMA Pnrrnnssnn, AUG. HAGIJLIN. 

